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- Aquifers 32
- Hydrology 17
- Groundwater 15
- Watersheds 14
- Irrigation 12
- Politics and government 11
- Agriculture 9
- Water-supply 9
- Economics 8
- Water quality 8
- Technology 7
- Palestinian Arabs 6
- Resource allocation 6
- Saline water conversion 6
- Hydrogeology 5
- Wells 5
- Demography 4
- Climate 3
- Contamination of environment 3
- Droughts 3
